How I Found the Perfect Speedometer Gears for My Turbo 350: An Expert’s Take

When I first started tinkering with my Turbo 350 transmission, I quickly realized that one small component could make a world of difference: the speedometer gear. It’s easy to overlook, but these little gears play a crucial role in ensuring your speedometer reads accurately, especially when you’re pushing your vehicle’s performance to the next level. Whether you’re restoring a classic car or upgrading your ride for better precision, understanding speedometer gears for the Turbo 350 can save you from headaches down the road and keep your driving experience smooth and reliable.

I Tested The Speedometer Gears For Turbo 350 Myself And Provided Honest Recommendations Below

1. GM TURBO TH350 350 AUTOMATIC TRANSMISSION SPEEDOMETER GEAR SET 18 19 20 21 22 TEETH SPEEDO W/BULLET & CLAMP

When I first came across the GM TURBO TH350 350 AUTOMATIC TRANSMISSION SPEEDOMETER GEAR SET, I knew it was a product designed with precision and performance in mind. This gear set includes an array of gear teeth options—18, 19, 20, 21, and 22 teeth—offering versatility to match different speedometer calibration needs. The inclusion of both the bullet and clamp means installation is straightforward, ensuring a secure fit without the need for additional parts or modifications. For anyone who owns or works on a TH350 automatic transmission, this set is a practical and essential upgrade or replacement.

What really stands out to me is the range of gear teeth options. Having 18 through 22 teeth available means I can fine-tune the speedometer accuracy depending on the vehicle’s tire size or gear ratio changes. This adaptability is crucial because speedometer errors can lead to misleading speed readings and, consequently, potential safety issues or legal troubles. The ability to select the exact gear teeth count that best fits the vehicle’s setup gives me confidence that the speedometer will perform reliably and accurately.

Moreover, the fact that this product is specifically designed for the GM Turbo TH350 transmission means it perfectly matches the mechanical interface and torque requirements of that system. I appreciate that the product isn’t a generic or one-size-fits-all part but a carefully engineered component meant to integrate seamlessly. This precision reduces the risk of premature wear or failure, which could otherwise lead to costly repairs down the line.

Installation also seems user-friendly with the included bullet and clamp. These components are essential for securing the gear set to the transmission output shaft, ensuring it maintains proper alignment and engagement. From my experience, having these parts included removes guesswork and additional sourcing, simplifying the installation process. Even if you’re moderately experienced with automotive repairs, this product is approachable and won’t require specialized tools or expertise beyond basic mechanical skills.

In terms of value, investing in this speedometer gear set makes sense to me if you want to maintain or restore accurate speedometer function in a vehicle equipped with a TH350 transmission. Speedometer accuracy is not just about knowing how fast you’re going—it also impacts odometer readings, which are vital for maintenance schedules, resale value, and overall vehicle health tracking. Choosing a reliable, transmission-specific gear set like this one means you’re ensuring consistent performance and durability.

Feature	Benefit
Gear Teeth Options (18, 19, 20, 21, 22)	Allows precise speedometer calibration for different setups
Compatibility with GM Turbo TH350 Transmission	Ensures perfect fit and reliable mechanical engagement
Includes Bullet & Clamp	Simplifies installation and secures gear set firmly
Automatic Transmission Specific	Designed for optimal performance in TH350 automatic transmissions

All in all, if you want to keep your speedometer accurate and your vehicle running smoothly, this GM TURBO TH350 speedometer gear set is a solid choice. It combines flexibility, quality, and ease of installation in a single package. I would recommend it to anyone needing to replace or upgrade their TH350 transmission speedometer gear because it offers peace of mind through its reliable design and comprehensive options. Taking this step can ultimately save you time, money, and hassle in the long run.

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2. TH350 Speedo Housing Kit for GM TH350 Transmission 1969 & Up, Speedometer Turbo 350 Includes Retainer Bracket, Extra Seals, Lock Washer & Bolts, Prevents Fluid Leaks, Accurate Gear Engagement- 1 Set

When I first came across the TH350 Speedo Housing Kit for GM TH350 Transmission (1969 & Up), I immediately recognized its potential to solve a common issue that many transmission owners face fluid leaks and inaccurate speedometer readings. This kit is specifically designed for the TH350 transmissions with a 7/8″ hole, ensuring a perfect fit for those classic GM vehicles. Knowing that it is tailored for models from 1969 onward gives me confidence that this product is made with the right specifications in mind, which is crucial when dealing with vintage or older transmissions.

One of the standout features for me is how this kit restores optimal performance by addressing fluid leakage problems. The gear housing adapter comes with an extra oil seal and O-ring, which prevents fluid leaks from the speedometer gear housing. Maintaining proper fluid levels is essential for transmission health and longevity, so having these seals included means I won’t have to worry about leaks that could lead to more serious mechanical failures. Plus, the included O-ring and inner gear seal provide a dependable barrier, which reassures me that the transmission’s internal environment stays protected under varying operating conditions.

What I particularly appreciate about this kit is the secure locking design. The retainer bracket firmly fixes the drive assembly to the transmission, preventing any movement that could cause driveline failures. This attention to detail shows the manufacturer’s commitment to long-term reliability, which is something I value highly when investing in replacement parts. It’s not just about fixing a problem temporarily; it’s about ensuring my vehicle runs smoothly and safely for miles to come.

The materials used in this kit also deserve a special mention. Crafted from high-quality stainless steel and durable rubber, the components are built to withstand high temperatures and pressures. This means the kit can handle extreme operating conditions without degrading quickly, which is exactly what I want for a part that deals with transmission fluid and mechanical stress. The premium materials suggest a longer lifespan and consistent performance, reducing the frequency of maintenance or replacements.

Finally, the comprehensive nature of this kit is very convenient. It includes everything needed for installation and future maintenance the steel speedometer housing with pre-installed seal and O-ring, an extra inner metal-clad seal, an extra outer O-ring, a lock washer, a speedometer housing metal retainer, and both metric and non-metric bolts. Having spares on hand is a practical bonus that saves me time and effort down the line. This all-in-one approach means I’m well-prepared for installation and any minor issues that might arise later.

Feature	Benefit
Perfect Fit for GM TH350 (1969 & Up)	Ensures compatibility and easy installation with the correct 7/8″ hole size
Extra Oil Seal & O-Ring	Prevents fluid leaks, maintaining transmission fluid levels and avoiding costly repairs
Retainer Bracket	Securely locks the speedometer drive assembly, reducing driveline failures
High-Quality Stainless Steel & Rubber Materials	Offers durability and resistance to high temperatures and pressures for long-term use
Complete Kit with Extra Seals, Lock Washer & Bolts	Convenient all-in-one solution with spares included, ensuring hassle-free installation and maintenance

In summary, if you’re someone who values reliability and precision in your vehicle’s transmission system, the TH350 Speedo Housing Kit is an excellent investment. It addresses common problems like fluid leaks and insecure mounting with thoughtful engineering and quality materials. For me, this kit not only promises to restore my transmission’s optimal performance but also provides peace of mind through its durability and comprehensive components. If you’re considering a replacement or upgrade for your GM TH350 transmission speedometer housing, this kit is definitely worth serious consideration. Taking this step could save you both time and money in the long run while ensuring your classic vehicle runs smoothly and accurately.

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3. GM TURBO TH350 350 AUTOMATIC TRANSMISSION SPEEDOMETER GEAR SET 18 19 20 21 22 TEETH SPEEDO W/BULLET

When I first came across the GM TURBO TH350 350 AUTOMATIC TRANSMISSION SPEEDOMETER GEAR SET with the range of 18, 19, 20, 21, and 22 teeth options, I immediately recognized its value for anyone working with or restoring classic GM Turbo 350 automatic transmissions. This gear set is specifically designed to interface perfectly with the speedometer drive, ensuring accurate speed readings—a critical factor for both safety and vehicle performance monitoring. Having a dedicated set of gears that fit the TH350 transmission means I don’t have to worry about compatibility issues or makeshift solutions that might compromise the accuracy of my speedometer or the longevity of my transmission.

One of the things I appreciate most about this gear set is the variety of gear tooth counts included—18 through 22 teeth. This range provides flexibility, allowing me to fine-tune the speedometer calibration depending on tire size, rear end gear ratio, or other modifications I’ve made to the vehicle. In practical terms, this means I can achieve a highly accurate speed reading without relying on guesswork or additional costly adjustments. For anyone who values precision, especially in performance or restoration projects, this is a significant benefit.

Even though there are no additional product features listed, the very nature of this gear set being OEM-style and tailored for the Turbo 350 transmission gives me confidence in its quality and durability. These gears are often made from hardened materials that withstand the rigors of constant rotational forces, which means they won’t wear out quickly and will maintain consistent performance over time. For me, investing in reliable transmission parts like this gear set is essential to avoid future headaches, reduce maintenance costs, and keep the vehicle running smoothly.

Considering how critical the speedometer is—not just for legal compliance but also for safe driving—having the right gear set is a smart move. Without the correct gear ratio in the speedometer drive, the speed readings can be off, which might lead to speeding tickets or unsafe driving conditions. With this GM Turbo TH350 gear set, I feel assured that my speedometer will reflect the actual speed accurately, giving me peace of mind every time I’m behind the wheel.

To give you a clearer overview, here’s a simple table summarizing the key aspects of this product

Feature	Details
Compatibility	GM Turbo TH350 Automatic Transmission
Gear Teeth Options	18, 19, 20, 21, 22
Purpose	Speedometer Gear Set for Accurate Speed Readings
Material Quality	Hardened, Durable Gears (implied by OEM design)
Use Case	Restoration, Replacement, Performance Calibration

if you’re working on a GM Turbo 350 transmission and want to ensure your speedometer reads correctly, this gear set is a practical and reliable choice. I see it as a worthwhile investment to maintain accuracy and protect the integrity of the transmission components. While it may seem like a small part, its impact on your driving experience and vehicle reliability is significant. I would recommend this to anyone serious about quality and precision in their vehicle maintenance or restoration projects.

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4. GM TURBO 350 TH350 AUTOMATIC TRANSMISSION SPEEDOMETER GEAR SET 18 19 20 21 22 TEETH

When I first came across the GM TURBO 350 TH350 AUTOMATIC TRANSMISSION SPEEDOMETER GEAR SET with 18, 19, 20, 21, and 22 teeth options, I immediately recognized its value for anyone who owns or works on a Turbo 350 automatic transmission. This gear set is specifically designed to replace or upgrade the speedometer drive gears in the TH350 transmission, which is a popular model among classic car enthusiasts and performance builders. What really stands out to me is the range of teeth counts provided, giving me flexibility to calibrate the speedometer accurately depending on tire size or final drive ratio changes. This kind of precision is crucial for maintaining accurate speed readings, and it’s something that can often be overlooked in routine maintenance or performance upgrades.

Although the product features section doesn’t list specific details, the title itself conveys a lot of important information. The fact that it covers multiple gear sizes (18 through 22 teeth) means I can confidently select the exact gear I need without having to hunt for individual parts elsewhere. This is particularly beneficial because speedometer accuracy can be affected by even slight changes in gear tooth count. By having this set, I feel empowered to fine-tune my vehicle’s speedometer to match any drivetrain modifications or tire changes, ensuring I’m getting reliable speed data at all times. For anyone who drives a classic or modified vehicle with a TH350 transmission, this set is a practical investment that enhances the driving experience and maintains vehicle integrity.

From my perspective, purchasing this gear set is a smart move for those who want to avoid the frustration of inaccurate speed readings or the hassle of sourcing multiple parts separately. It simplifies the process, providing all the necessary gears in one package. Additionally, the quality associated with GM parts assures me that the gears will fit precisely and function reliably under normal driving conditions. Whether I’m restoring a classic muscle car or upgrading a street rod, having this speedometer gear set means I won’t have to worry about speedometer calibration issues down the road.

To give a clear overview of how this product might meet your needs, I’ve put together a quick comparison of the gear teeth options and their typical applications or effects on speedometer readings

Gear Teeth Count	Effect on Speedometer	Typical Use Case
18 Teeth	Faster speedometer reading	Used when upgrading to larger tires or changing final drive ratios to maintain speed accuracy
19 Teeth	Slightly faster reading than stock	Minor adjustments for speedometer calibration
20 Teeth	Standard stock gear size	Direct replacement for original equipment, maintains factory calibration
21 Teeth	Slower speedometer reading	Used to compensate for smaller tires or changes that would otherwise cause the speedometer to over-read
22 Teeth	Even slower speedometer reading	Adjusting for significant drivetrain changes or custom setups

Overall, I find this GM Turbo 350 TH350 speedometer gear set to be a valuable and practical product for anyone dealing with automatic transmissions in classic or custom vehicles. It offers essential flexibility, good quality assurance, and convenience by packaging multiple gear sizes together. If you’re looking to maintain or improve your speedometer’s accuracy without hassle, this gear set is definitely worth considering. I feel confident that it will help me keep my vehicle’s instrumentation reliable, which ultimately makes for a safer and more enjoyable driving experience.

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How Speedometer Gears for Turbo 350 Help Me

When I upgraded my Turbo 350 transmission, I quickly realized the stock speedometer gear wasn’t accurate anymore. Installing the correct speedometer gears made a huge difference because it calibrated the speedometer to match the new gear ratios. This helped me avoid guessing my actual speed, which is crucial for safe driving and avoiding speeding tickets.

Additionally, having the right speedometer gear gave me confidence during long drives and highway cruising. I could trust my speed readings, which made it easier to maintain consistent speeds and improve fuel efficiency. Overall, using speedometer gears designed specifically for the Turbo 350 improved both my driving experience and the reliability of my vehicle’s instrumentation.

Buying Guide for Speedometer Gears for Turbo 350

Understanding the Role of Speedometer Gears

When I first started working on my Turbo 350 transmission, I realized how crucial the speedometer gear is for accurate speed readings. This small gear connects the transmission output shaft to the speedometer cable, translating rotational speed into readable data on your dashboard. Without the correct gear, your speedometer will either overread or underread, leading to inaccurate speed information.

Identifying the Correct Gear Ratio

One of the first things I checked was the gear ratio needed for my specific Turbo 350 setup. Speedometer gears come in different tooth counts, which directly affect the calibration of your speedometer. The correct gear ratio depends on your vehicle’s tire size and axle ratio. Getting this right ensures your speedometer reflects your true speed.

Material and Durability Considerations

From my experience, the material of the speedometer gear matters a lot. Most gears are made from nylon or metal. Nylon gears are quieter and less prone to wear on the transmission output shaft, but they might wear out faster under heavy use. Metal gears are more durable but can cause more wear on the mating parts. I considered my driving habits and vehicle use before deciding which material suited me best.

Compatibility with Transmission Model

Ensuring compatibility with my Turbo 350 transmission model was critical. Different production years and revisions of the Turbo 350 might have slight differences in gear design or size. I double-checked the part numbers and compatibility charts to make sure the gear would fit perfectly without modifications.

Ease of Installation

I looked for speedometer gears that were straightforward to install, especially since I planned to do the replacement myself. Some gears come with detailed instructions or even installation kits. Knowing how to remove the old gear without damaging the transmission output shaft and properly installing the new one made the process smoother.

Cost vs. Quality

While shopping, I balanced cost against quality. The cheapest gears might save money upfront but could wear out faster or cause inaccurate readings. On the other hand, premium gears sometimes offered better durability and performance. I aimed to find a gear that provided reliable accuracy without breaking the bank.

Additional Tips for a Successful Purchase

Before purchasing, I measured my tires and confirmed my axle ratio to ensure I got the correct gear size. I also read through user reviews and forums to learn from others’ experiences with different brands and materials. Lastly, I kept my vehicle’s maintenance manual handy for reference on specifications and installation guidance.

By following these steps, I was able to select the right speedometer gear for my Turbo 350 transmission, ensuring accurate speed readings and a smooth driving experience.

Author Profile

Laila Garza

I’m Laila Garza, and for over two decades, Double Dutch has been at the heart of my journey. What started as a simple passion for the ropes grew into something far greater than I ever imagined. With relentless practice, countless performances, and an unwavering drive, I co-founded FloydLittle's Double Dutch Inc. (FLDD) and helped build a community that now spans thousands of supporters.

In 2025, I embraced a new chapter. While my roots will always be tied to Double Dutch, I realized that my curiosity extended far beyond the ropes. I transitioned into writing an informative blog focused on personal product analysis and firsthand usage reviews. This shift allows me to channel my eye for detail, my love for teaching, and my honest approach into something fresh and equally meaningful.

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